I was using an older version of Imagemagick, 6.8.0, I believe, and the Perl command for adding a comment was not working. I could get it to work fine with just a CLI but the Perl module for that one particular function just never added a comment. I decided to uninstall and reinstall with the latest version of Imagemagick and Strawberry Perl. I was under the impression I just need to install Perl and ImageMagick but it doesn't seem to install PerlMagick even though I selected the option in the ImageMagick install.